Double shell cap for containers



May 26, 1936. w. G. SKUTCH DOUBLE SHELL CAP FOR CONTAINERS Filed Oct. 12, 1934 IN VEN TOR.

Patented May 26, 1936 2,042,028 DOUBLE SHELL can roa commas William G. Skutch, Toledo, Ohio, assignor to The Closure Service Company, Toledo, Ohio, a corporation of Ohio Application October 12, 1934, Serial No. 748,093

1 Claim. '(Cl. 215-43) My invention relates to caps or closure devices for bottles, jars and the like. The invention relates particularly to improvements in that type of cap which includes an inner and an outer shell nested together.

Considerable difliculty has been experienced with caps of this type, owing to the tendency of the outer shell to slip or turn relative to the inner shell when the cap is being screwed onto or off the container. An object of my invention is to overcome this difiiculty by the provision of means for securely interconnecting the inner and outer shells in a manner which will positively'prevent such relative rotation or slippage.

Other objects of the invention will appear hereinafter.

Referring to the accompanying drawing:

Fig. 1 is a fragmentary view of a jar with a.

cap thereon. v

Fig. 2 is a sectional elevation of the cap.

Fig. 3 is a sectional elevation of the outer shell before it has been assembled with the inner shell. shFig. 4 is a part sectional view of the inner ell.

Fig. 5 is a fragmentary sectional elevation of a modified construction, showing particularly the connection between the lower margins of the shells.

Fig. 6 is a sectional plan of the same, the section being taken at the line VI-VI on Fig. 5.

The cap and closure device Ill comprises an outer shell I2 and an inner shell l4, the latter formed with screw threads [5 for engagement 35 with corresponding threadsf formed on the neck of the container l6.

The outer shell I2 is preferably made of sheet metal in a single piece. It comprises a circular top cover portion I! which, as shown, is somewhat convex, and a depending annular flange or skirt 18 which in the finished cap presents a smooth exterior surface. The shell [2 may be stamped from sheet metal stock and drawn by suitable dies, to the shape shown in Fig. 3. The edge of the shell is scalloped or cut to form an annular series of lobes or projections IS.

The inner shell It also comprises a circular top and a depending skirt. The skirt is formed along its lower margin with an annular series of ribs or the like 2! projecting inwardly on the interior surface of the shell.

After the shell M has been placed in position within the outer shell l2, the lower scalloped margin of the outer shell is rolled inwardly to grip the margin of the inner shell. The lobes l9 engage the corrugated or ribbed margin of the inner shell with said lobes positioned between the ribs 2 I. .Itwill be seen that with this construction, the lobes l9 and ribs 2! provide interlocking or holding surfaces so that the inner and outer shells are securely interengaged or locked in a manner to reliably and positively prevent relative rotation of the shells when a turning force is applied to the cap either for tightening it on thecontainer or removing it therefrom. In the finished cap, the scalloped margin l9 lies wholly within the cap and is spaced a substantial distance above the lower edge of the cap so that the latter presents a smooth finished appearance.

In the construction shown in Figs. 5 and 6, the inner shell is formed with rounded corrugations 22 whch conform closely to the contour of the scallops i9 with which they are interlocked.

Modifications may be resorted to within the spirit and scope of my invention.

I claim:

A cap comprising an inner shell and an outer shell nested together, each shell having. a top portion and a depending skirt, the skirt of the inner shell having an intermediate portion formed with means for attaching the cap to the neck of a' container, the portion of the skirt below said attaching means being extended vertically downward with its free edge facingdownward, an annular series of curved corrugations formed on the lower marginal portion of said inner skirt and extending upward from said free edge, the margin of the outer shell being rolled inwardly around the margin of the inner shell, the free edge of the outer shell margin being scalloped to form an annular series of correspondingly curved projecting lugs, said lugs interlocking with said corrugations on the inner shell and thereby positively holding said shells against relative rotative movement.

WILLIAM G. SKUTCH. 

